I would think it was the food. A lot of people (me included) get very nauseated and even sick if they lay down to sleep after eating a heavy meal. It happened to me the other night after eating a TON of sushi and drinking two huge glasses of iced tea. I came home and fell asleep for an hour and woke up and felt sooooo ill! I was sure I had FP, but my friend who ate the same thing I did was absolutely fine, and I was absolutely fine once I fought the nausea for about an hour or so and took some Benadryl. I'm sure you will be just fine